The sketches are exactly the same.
I changed SK9822 to WS2812B
and
// LED Init
FastLED.addLeds<LED_TYPE, DATA_PIN, CLOCK_PIN, COLOR_ORDER>(leds, NUM_LEDS).setDither(0);
to
FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS).setDither(0);
I also tried: FastLED.addLeds<WS2812B, 2, GRB>(leds, NUM_LEDS).setDither(0);
Nothing helps. 🙁